Exhaust manifold for engine
First Claim
1. An exhaust manifold for an engine, comprising a manifold body which is comprised of a plurality of branch pipes and a common collecting chamber integrally connected to said branch pipes and communicating with an exhaust emission control device, a first flange plate to which said branch pipes are connected, and a second flange plate to which said common collecting chamber is connected, said first and second flange plates being disposed on planes that intersect with each other at substantially a right angle, and said manifold body being divided into an upper half and a lower half at a boundary face extending in a direction of arrangement of the branch pipes, the branch pipes extending from said first flange plate toward said second flange plate while being curved, the upper and lower halves being made of respective steel plates and welded to each other, wherein a welding mating coupler is formed by opposed outer edges of said upper and lower halves which are located at outermost positions in said direction of arrangement of said branch pipes, and a welding stepped superposing coupler is formed by opposed inner edges of said upper and lower halves facing each of clearances between adjacent ones of the branch pipes, and wherein mounting portions are provided on said first flange plate at locations between said adjacent branch pipes.
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Accused Products
Abstract
An exhaust manifold for an engine includes a manifold body 7 having a plurality of branch pipes and a common collecting chamber integrally connected to the branch pipes and communicating with an exhaust emission control device is divided into an upper half and a lower half at a boundary face extending in a direction of arrangement of the branch pipes. The upper and lower halves are made of steel plates and welded to each other. In the exhaust manifold, a welding mating coupler is formed by outer edges of the upper and lower halves, and a welding stepped superposing coupler is formed by inner edges of the upper and lower halves. Thus, during welding, it is possible to limit the misalignment of the upper and lower halves in a direction along the boundary face and the misalignment of the upper and lower halves in a direction perpendicular to the boundary face by cooperation of the mating coupler and the stepped superposing coupler. In addition, because the stepped superposing coupler is used for coupling of inner edges of the upper and lower halves to each other, it is possible to ensure sufficient clearances between the adjacent branch pipes, and to easily conduct the operation of mounting of the exhaust manifold to the engine by utilizing the clearances.
35 Citations
7 Claims
- 1. An exhaust manifold for an engine, comprising a manifold body which is comprised of a plurality of branch pipes and a common collecting chamber integrally connected to said branch pipes and communicating with an exhaust emission control device, a first flange plate to which said branch pipes are connected, and a second flange plate to which said common collecting chamber is connected, said first and second flange plates being disposed on planes that intersect with each other at substantially a right angle, and said manifold body being divided into an upper half and a lower half at a boundary face extending in a direction of arrangement of the branch pipes, the branch pipes extending from said first flange plate toward said second flange plate while being curved, the upper and lower halves being made of respective steel plates and welded to each other, wherein a welding mating coupler is formed by opposed outer edges of said upper and lower halves which are located at outermost positions in said direction of arrangement of said branch pipes, and a welding stepped superposing coupler is formed by opposed inner edges of said upper and lower halves facing each of clearances between adjacent ones of the branch pipes, and wherein mounting portions are provided on said first flange plate at locations between said adjacent branch pipes.
Specification